Nuclear Chain Reaction

# CHAIN REACTION Kr A free neutron (a subatomic particle without a charge) collides Kr with an atom of uranium-235 Ba A neutron splits atoms of U-235 into smaller Energy (heat) Kr atoms and heat energy... Ba and free neutrons, U-235 is split into two particles of lighter elements (Krypton and Barium in this example, though there are variations) which go on to react with other atoms. Ba The reaction also emits 2 or 3 neutrons (which will go on to collide with other atoms of uranium-235). The products of fission, including the expended neutrons, weigh less than uranium-235. The difference in weight becomes energy-a lot of energy, according to the famous E = mc², where E = energy, m = missing mass, c = speed of light.